diff --git a/ext/libstrawberry-tagreader/tagreadermessages.proto b/ext/libstrawberry-tagreader/tagreadermessages.proto
index 629e9c103..5b8019320 100644
--- a/ext/libstrawberry-tagreader/tagreadermessages.proto
+++ b/ext/libstrawberry-tagreader/tagreadermessages.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 package pb.tagreader;
 
 message SongMetadata {